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Tian, X. (author)This study investigates the application of inverse modeling in numerical geo-energy scenarios such as petroleum, geothermal, and CCS projects. The study aims to enhance model accuracy and predictive capabilities for real-world applications. The focus lies on the implementation of the inverse modeling framework within the open-source simulator...doctoral thesis 2023
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Thalhammer, Marlene (author)The active layer thickness has become an important indicator in climate change research as permafrost degradation has long been documented. The thawing of permafrost causes the release of greenhouse gases accelerating Arctic warming. Monitoring and quantifying spatial and temporal changes of the active layer are challenging but crucial for...master thesis 2022
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Leegwater, Marjolein (author)Ammonia (NH3) is an important chemical compound in the nitrogen cycle. Ammonia is an essential nutrient and an important part of fertilizer, which in soil leads to increased growth of crops. However, the current excess of NH3 emissions is a hazard to environmental and human health. While ammonia<br/>emissions need to be reduced, the emission...master thesis 2021
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Dahoe, Terrence (author)The estimation of railway track parameters from a target frequency response function is a non-convex optimization problem. The objective of this thesis is to evaluate new evolutionary optimization methods to solve the railway track optimization problem. We use a Python based platform, since this programming language is increasing in popularity...bachelor thesis 2021
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van 't Klooster, Floris (author)In this report, the tidal method is used to estimate hydraulic aquifer parameters. The principle of the tidal method is to use head fluctuations in observation wells, caused by tidal motion in a sea or river, to determine regional hydrological characteristics of an aquifer system. As the wave propagates into the aquifer, the amplitude of the...master thesis 2021
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An, Seongnam (author), Kang, Peter K. (author), Stuyfzand, Pieter Jan (author), Lee, Woonghee (author), Park, Saerom (author), Yun, Seong Taek (author), Lee, Seunghak (author)Various hydrogeochemical processes can modify the quality of river water during riverbank filtration (RBF). Identifying the subsurface processes responsible for the bank-filtered water quality is challenging, but essential for predicting water quality changes and determining the necessity of post-treatment. However, no systematic approach for...journal article 2021
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Zijlker, Tammo (author)This study aims to improve estimates of NOx emission strengths by assimilation of TROPOMI satellite retrievals in the LOTOS-EUROS chemical transport model. Nitrogen oxides (NO and NO2) play a pivotal role in atmospheric chemistry, are an important source of air pollution and contribute to nitrogen deposition over vulnerable natural areas....master thesis 2020
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van der Geugten, Gerald (author)In this thesis a deterministic wave model is used to reconstruct and predict the sea surface motion from FMCW (Frequency Modulated Continuous Wave) radar data, produced by Radac. The deterministic model that is used to do this is based on the linear wave theory. The radar is looking horizontally straight towards the waves in 5 separate beam...master thesis 2020
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Rasooli, A. (author), Itard, L.C.M. (author)The advancement of smart metering and sensor technologies has opened the door to performing extensive in-situ measurements in buildings and a tendency to carry-out detailed energy and indoor climate monitoring, leading to the availability of the so-called “on-board monitoring data”. The data obtained through these measurements is of high...journal article 2020
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Xiao, C. (author), Tian, Leng (author)This paper introduces an efficient surrogate model with the aim of accelerating joint estimation of subsurface geological properties and relative permeability parameters for high-dimensional inversion problems. We fully replace the high-fidelity model with a set of subdomain linear models through integrating model linearization with smooth...journal article 2020
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Jongbloed, Henk (author)Reliable and efficient modelling of magnetic hysteresis in inhomogeneous and aniso-tropic media is an important step in developing a state-of-the-art closed-loop degaussing system for naval ships and submarines, to be developed by TNO and to be used by the Royal Netherlands Navy in an updated generation of naval vessels and submarines. Different...master thesis 2019
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Booms, Daniel (author)Most ocean-going ships are fitted with an impressed current cathodic protection (ICCP) system. The currents impressed by this system onto the seawater find their way to corroding parts of the ship’s hull, and prevent the hull from corroding. The electric field resulting from the currents around the ship is called the electric signature. This...master thesis 2019
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Agliata, R. (author), Bogaard, T.A. (author), Greco, Roberto (author), Mollo, Luigi (author), Slob, E.C. (author), Steele-Dunne, S.C. (author)Measuring water content in buildings of historical value requires non-invasive techniques to avoid the damage that sample taking or probe insertion may cause to the investigated walls. With this aim, a stepped frequency ground penetrating radar (GPR) system was tested to assess its applicability in moisture measurements of porous masonry...journal article 2018
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Gupta, Palak (author)This thesis deals with determination of Resistance (R) value and Heat Capacity of building envelopes in the commonly found residential architecture in Holland i.e. pitched roof houses. The aim of this thesis is to find an easy to implement novel method which gives reasonably accurate results. In the absence of actual sensor data, the data-sets...master thesis 2017
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Carniato, L. (author)Predicting the evolution of groundwater contamination is a major concern for society, in particular when investments are made to remediate the contamination. Groundwater reactive transport models are valuable tools to integrate the available measurements in a consistent framework, improving our understanding of the physical system and...doctoral thesis 2014
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Hobson, D.A. (author)The precast concrete sector is growing and to continue this growth it is necessary that new innovations, ideas, technologies etc. are developed to improve the functionality of precast concrete structures. Many applications can be found nowadays for all different kinds of precast concrete elements. One such application for example is precast...master thesis 2014
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Korteland, S. (author)The shallow subsurface is an important zone from a social, economical, and environmental point of view. The increased use of the shallow subsurface together with the call for its protection and sustainable exploitation have increased the need for tools to monitor and characterize the subsurface, as well as for an improved understanding of the...doctoral thesis 2013
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Vermeulen, P.T.M. (author), Te Stroet, C.B.M. (author), Heemink, A.W. (author)Despite increasing computational resources many high?dimensional applications are impractical for model inversions. In this paper, two methods are presented that are promising for high?dimensional model inversion. The methods draw on proper orthogonal decomposition (POD) and yield reduced models that describe a truncated behavior of the original...journal article 2006
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Lambot, S. (author), Antoine, M. (author), Vanclooster, M. (author), Slob, E.C. (author)We report on a laboratory experiment that investigates the effect of soil surface roughness on the identification of the soil electromagnetic properties from full-wave inversion of ground-penetrating radar (GPR) data in the frequency domain. The GPR system consists of an ultrawide band stepped-frequency continuous-wave radar combined with an off...journal article 2006
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Vermeulen, P.T.M. (author), Heemink, A.W. (author), Valstar, J.R. (author)Numerical groundwater flow models often have a very high number of model cells (greater than a million). Such models are computationally very demanding, which is disadvantageous for inverse modeling. This paper describes a low?dimensional formulation for groundwater flow that reduces the computational burden necessary for inverse modeling. The...journal article 2005